They should stucco the outside as a re-fresh and add digital signage to the large blank walls. On the inside, align the seats to look at the infield (football configuration now), get rid of the Jay shops that separate the concourse from the seating, and eliminate big swaths of seating on the 500 level - replace them with go-to attractions like the popular West Jet sky deck.
Those of are minor concern. The big issues is, it's an indoor stadium. Even when the roof is open, you don't get that feeling you're in a baseball stadium because everything is so high and enclosed. The current situation right now, it's like being in a car with a sun roof, as apposed to a convertible.
They have to find a way to tear down the walls a bit and some how create some other open space areas, otherwise your wasting your time and not getting the desired outcome of true classic ballpark, but with a modern twist to it that still allows games to be played when it rains.